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M. HOPSTAD.

ELASTIC OENTBR EMBRY GRINDING AND POLISHING WHEEL.

No. 254,011. I Patented Peb. 21,1882.-

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N4 PETERS, Fhclo-Lx'lhngnphar. wmhin lon. n. c.

. ITE STATES PATENT OFFICE.

MARTIN HOFSTAD, OF SAN LEANDRO, CALIFORNIA.

ELASTIC-CENTER EMERY GRINDING AND POLISHING WHEEL.

SPECIFICATION forming part of Letters Patent No. 254,011, dated February 21, 1882.

Application filed August 3, 1880.

To all whom it mag concern:

Be it known that I, MARTIN HOFSTAD, of San Leandro, California, have invented anew and useful Elastic-Center Emery Grinding and Polishing Wheel, of which thefollowing is a specification.

Figure l is a perspective View; Fig.2, a section of the combined grinding and polishing wheel complete. Fig. 3 is the polishing-wheel complete; Fig. 4, a solid emery rim for a grinding-wheel; Fig. 5, a flange or outer clampingring to hold the wheel together firmly; Fig. 6,

the inner clamping-ring to holdthe'periphery of the polisher and secure an even surface.

A represents the outer or grinding rim; B, the outer clamping-rings; O, the inner clamping-rings; D and E, the flanged hub and center clamp; F,the body of the polishing-wheel, composed of sacking or other fabric or elastic substance. The following is the construction of the same: I make the grinding-rim of emcry or other grinding material, composed in the usual way. The inner wheel or elastic center is made of sacking or any suitable textile material, to be packed together and bolted between the rings 0 and the hub -flanges D E, the loose flange E being taken off for the purpose of inserting through the fabric or other elastic substances forming the center or polishing wheel. These flanges are all tightened,

and the edges of the fabric trimmed to an even surface outside of the rings 0, and any suitable composition applied to form the polishingsurface in the usual way. When the wheel is (No model.)

needed only for grinding the same kind of 5 1. Acombincd grinding and polishing wheel consisting of a central hub, a polishing-disk, a removable grinding-rim, and means, substantially as described, for securing the polupon the polishin g-disk.

2. The combination, with the flanged hub, the clamping-rill gs O,and the yielding or elastic center F, of the outer removable clampingrings, B, and the detachable grinding-rim A.

3. The combined grinding and polishing wheel composed of the outer rim, A, the outer clamping rings or flanges, B, the inner clamping rings, 0, the yielding center, and the hub having fixed and loose flanges, all substantially as described. 7

MARTIN HOFSTAD; Witnesses:

JOHN H. REDsToNE, FRANK R. BRANN.

ishing-disk upon the hub and the grinding-rim 

